Get a credit transaction
Returns one credit transaction, such as a top-up or an adjustment. The monthly usage rows that List credit transactions returns (IDs like usage_2026-09-30) are summaries and can’t be fetched here.
Authentication
Use your Respan API key for Respan API authentication. Enter only the Respan API key value; clients send Authorization: Bearer <RESPAN_API_KEY>. For /api/responses, provider credentials such as Perplexity, OpenAI, or Azure OpenAI go in Settings -> Providers or respan_params.credential_override in the request body, not in this authentication field.
Use a dashboard JWT only for dashboard-authenticated endpoints. Respan API-key endpoints use the respanApiKey auth field instead.
Path parameters
The unique identifier of the transaction to retrieve (e.g., ct_1a2b3c4d5e6f7g8h)